For some reason I was reading the Wikipedia page on driving on the left or right and there's a section on advantages which includes, for driving on the right:
“Traffic on roundabouts and other giratory systems flows in a counter-clockwise direction, which is more natural to most people, who draw circles counter-clockwise.”
Putting aside the mispelling of “gyratory”, since I read that first I now have no idea which way I draw circles. I now have a page of the things which I drew both ways, and neither felt correct. Hopefully, if you followed the instructions at the start of this post, you'll be able to tell me...